Grinding device.



W. s. HANNAN. GRINDING DEVICE. APPLICATION FILED APR.22, 1906.

91 5,430. Patented Mar. 16, 1909.

Alina-flaw Witnesses lnvenCor.v I Walham 6 Human.

y AM WILLIAM s. HaN'NA'N, or soHENEoT nYmEw YORK.

I GRINDING DEVICE.

Specification of Letters Patent. latented March 15, 1909.

Application filed April 22, 1908. Seria1N6.428,479.

To all whom i t may concern:

Be it known that I, V ILLIAM S. HANNAN, a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and "useful Improvements in Grinding DEVICES,-

' of which the following is aspecifi'cation.

Thisinvention relates to grinding or abrading devices and has for its object the provision of means .vhereby a grinding operation may be performed in a simple, accurate and reliable manner. 1

- My invention relates more specifically tov devices for grinding-knives and the like.

Incarrying out my invention I employ a) grinding wheel-or disk having an abrading surface on the flat portion instead of on the edge or peri hery of the wheel: .The disk which I emp oy is flexible having a solid or rigid outer portion and a flexible inner portion so that the abrading surface will yield under the. pressure of theknife to produce a uniform result in a very sim le manner. In connection with this disk also provide a gliding or resting device so arranged that the knife may be held at a definite angle with the abrading surface by an unskilled hand. I.

. Referring to the drawing also employ means for securing the parts of the disk in place, which may be operated to release the parts by the use of the knife itself.

My invention therefore comprises the features of construction and the arrangement and combination of elements hereinafter set forth and particularly pointed out in the claims annexed hereto.

In the accompanying drawing in which I have shown any invention embodied in concrete form, Figure 1 is 'an. elevation of a grindin disk embodying my invention; Fig. 2-is a p an view of the-same; Fig. 3 is al enlarged elevation, partly in section, of the device; and Fig. 4'is a similar ViQ'W of a modifiedform of my invention. v

I 10 is the central supportmgstud of the d1sk provided with 'screw threads and adapted to be driven by -chine as shown in the rotating element 11 of a grinding ma- Fig. 1 Secured upon this-stud is afbearing collar' 12 having a curved portion 13 which may be approximately spherical in shape. '28. supporting 1platel t, preferably. of metal, is adapted to' t over the stud and engage thecurved portior. of the collar 12. This late has a flat outer portion in the shape 0 a ring and its 'treme inner end being bent to conform to the shape of the surface 13. A sheet 15, preferably of some flexible material such as sand-paper or emery cloth, is mounted upon the plate and extends beyond the ring portion and into close proximity with the stud lOso as to rest upon the collar 12. A clamping nut 16 is screwed on to the stud so as to secure the abrading disk in place by clamp: ing it to the collar so that the sheet 15 will rotate with the stud. 4

The supporting plate 14'is loosely mounted upon the collar and will not. necessarily ro-' tate therewith until pressure is applied to the. surface 13. By making the supporting late 14 loose the disk, as a whole, is renc ered flexible since as the plate and sheet are forced downward on one side of the stud the flexible sheet bends on the opposite side atthe point.- 17 or between 'the outer clamping surface of the nut 16 and the fiatport-ion of the plate. The clamping nut 16 is provided with beveled portions 18 adapted to receive the back of the knife and hold the same in definite relation with the abrading surface. By having a lurality of beveled surfaces the knife mav sired The nut 16 is provided with a slot 19 for unscrewing it. This arrangement is very convenient since it is ossible to remove the nut without the use 0 any tools as the back of the knife may be placed in the slot to act as a lever as shown. When the stud 10 is rotated the abrading sheet 15 will be likewise positively rotated but as the supporting ring 14 is loose it willnot rotate untll the sheet is re. u'ired to turn the disk since lesspressureh wi be applied to the disk and there 1s less danger of destroying the knife by drawing 3 the temper because of excessive pressure.

In Fig. 4 I have showna modified form of -my invention in which the disk is made flexie ground at different angles as deble by means of a sheet or plate of elastic material 20, such as rubber or the like. This rubber center is secured in clips on the plate 21 and is clamped to the grinding sheet between the nut 19 and the collar 22. The essential featuresiof "the disk, however, remain the same in this case as it is-rigid at its outer and central portions and flexible intermeinner'portiqn, a rigid ring diate these scribed.

portions for purposes above de- While'I have illustrated my invention. in

connection with s ecific structural detailsand "arrangement 0 parts it should be .un derstood that I do not limit my invention in these particulars exce t inso far. as it is lim- I 'ited by the scopeo the claims annexed 2. A grinding disk comprising a flexible- '3. A grinding disk comprising a si me including a rigid outer ring, a sheet of exible abrasive material mounted thereon so as to extend within the same, a clamdping device engaging the sheet and separate therefrom to-leave the intermediate portion of the sheet unsup orted: I 1 1 4. 1i grinding disk comprising a flexible sheet of abrasive material, a rigid plate form-.

ing an outer supporting ring for the sheet,

and means within the'rmg for securing the sheet and plate;,together, said means being abrasive sheet.

separated from the supporting ring to leave the intermediate portion of the sheet unsup- :ported. g V y Y 5. A grindingdisk comprising asupport-f mg outer ring, a sheet of flexible abrasive material mounted thereon and extending Within the ring so as to, have an inner unsupported portion, a central stud passing through the.

plate and sheet, and a'slotted nut on said stud or securin the parts in lace. 6'. A kni e ding dis comprising a sup portingplate avinga flatoliter ring portion,

a sheet of flexible abrasive material mounted thereon and extending within the ring, a cen:

ti'alstud passing t ough the plate and sheet, and a clamping d I p lnurfality of beveled surfaces for supporting a e at different grinding angles with the 7. A knife grinding disk comprising a supa sheet of flexible abraslve-material mounted tral stud passing throu h the plate and sheet,

' a clamping devicefor t e sheet having a beveled surface for su porting a knife at a fixed grinding anglewit the sheet, nut slotted to receive the knife.

In witness whereof, I- have hereunto set' my hand this 14th day of April, 1908. I WM. S. HANNAN. Witnesses: M

CHARLOTTE SEooR, F. J. S ABOLT'.

l ce for the sheet having a 5 5, 1 porting plate having a flat outer ring portion,

thereon and extending within the ring, a cenand a securing 

